digraph Flow {
  edge [fontname="helvetica",fontsize="10pt"];
  node [shape=ellipse,fontname="helvetica",fontsize="10pt"];
  doxygen;
  doxyindexer;
  doxysearch [label="doxysearch.cgi"];
  browser [label="HTML page\nin browser"];
  node [shape=note];
  searchdata [label="searchdata.xml"];
  searchindex [label="doxysearch.db"];

  doxygen -> searchdata [label=" writes"];
  searchdata -> doxyindexer [label=" reads"];
  doxyindexer -> searchindex [label=" writes"];
  searchindex -> doxysearch [label=" reads"];
  doxysearch -> browser [label=" get results "];
  browser -> doxysearch [label=" query "];
}